Complete subshell notation listing all occupied orbitals
Noble-gas shorthand[Ar] 4s² 3d⁶
Valence electrons8
Total electrons26
Electrons per shell2, 8, 14, 2
Shell 1 (K)2
Shell 2 (L)8
Shell 3 (M)14
Shell 4 (N)2
Shell 5 (O)0
Shell 6 (P)0
Shell 7 (Q)0
Shell 1 (K)2
Shell 2 (L)8
Shell 3 (M)14
Shell 4 (N)2
Shell 5 (O)0
Shell 6 (P)0
Shell 7 (Q)0
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Iron: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶
Iron has 26 electrons and 8 valence electrons.
Electron distribution across shells: 2, 8, 14, 2.
Next stepTo find the ion configuration, select a charge above. For transition metal cations, electrons are removed from the outermost s subshell before the d subshell.